21222223331 has 4 divisors (see below), whose sum is σ = 21222543912. Its totient is φ = 21221902752.

The previous prime is 21222223327. The next prime is 21222223339. The reversal of 21222223331 is 13332222212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222223331 - 2² = 21222223327 is a prime.

It is a super-2 number, since 2×21222223331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222223297 and 21222223306.

It is not an unprimeable number, because it can be changed into a prime (21222223339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20150 + ... + 207003.

It is an arithmetic number, because the mean of its divisors is an integer number (5305635978).

Almost surely, 2^21222223331 is an apocalyptic number.

21222223331 is a deficient number, since it is larger than the sum of its proper divisors (320581).

21222223331 is an equidigital number, since it uses as much as digits as its factorization.

21222223331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320580.

The product of its digits is 1728, while the sum is 23.

Adding to 21222223331 its reverse (13332222212), we get a palindrome (34554445543).

The spelling of 21222223331 in words is "twenty-one billion, two hundred twenty-two million, two hundred twenty-three thousand, three hundred thirty-one".